I have a 2007 EL Limited. After hitting 100K+ miles, experienced the issue in which the front wheels hubs would start to engage, without having to select any 4WD option, thereby creating a very obvious rattling sound. Sometimes very loud, sometimes a light rattling sound. After some research, found out it is a vacuum issue with the IWE solinoid which controls the locking feature of the front hubs when you engage 4A etc. As most know, the front wheels lock when in park and engine off and the IWE, using a vacuum, disengages them so you aren't driving in 4 WD unless you engage. After 4 trips to the shop, having the IWE replaced, new vacuum lines, the left fron hub replaced(where all the noise comes from), and the vacuum tested, the truck still, occasionally and mostly at the very beginning of driving after having been parked, will make the rattling sound which goes away after a few seconds. This doesn't happen for the rest of the drive. Why does this happen? Does it still need to be looked at again?
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